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Q690高强钢厚板焊后力学性能

钢结构（中英文） 2024年第5期39卷 17-26页

作者：金皓朱梦飞钟国辉王焰华刘海龙香港理工大学土木与环境工程学院中国香港999077 香港理工大学国家钢结构工程技术研究中心香港分中心中国香港999077 中国路桥工程有限责任公司(港澳地区) 中国香港999077

对50、70 mm厚的高强度Q690钢板及其对接焊接件在拉伸条件下的机械性能进行了全面研究,共进行了40次拉伸试验。首先,针对母材在钢板厚度范围内的3个不同层上提取了18个圆形截面比例试样。对所有这些试样进行了拉伸试验,以获得其机械性能... 详细信息

对50、70 mm厚的高强度Q690钢板及其对接焊接件在拉伸条件下的机械性能进行了全面研究,共进行了40次拉伸试验。首先,针对母材在钢板厚度范围内的3个不同层上提取了18个圆形截面比例试样。对所有这些试样进行了拉伸试验,以获得其机械性能,并研究了它们在不同板厚上的变化。其次,在这些厚钢板之间采用不同热输入能量的埋弧焊制备焊接件。此外,还对焊接部分的典型热影响区进行了微观结构检查。对总共22个矩形截面标准试样进行了拉伸试验,以获得其机械性能,并评估和比较了这些试样的全方位变形特性,特别是其抗拉强度和断裂伸长率,以评价热输入对厚板焊接件力学性能的影响。在拉伸试验过程中,使用数字图像相关技术(DIC)观测并记录试件表面在拉伸状态下的真实应变,进一步研究热影响区对焊接件力学性能的影响。通过针对母材的试验发现,从50 mm厚Q690钢板的各层中取出的试件,其力学性能只有可忽略不计的差别,可以认定沿板厚方向,50 mm板各层之间的力学性能是均一的。而70 mm板中层取出的试件,其屈服强度与抗拉强度相较于上、下两层中的试件,各有7%与6%的折减,而断后延伸率则相差不大。对于焊接件的试验表明,相对于16 mm Q690板,焊接热输入对50、70 mm厚板的力学性能影响更小:对16 mm板焊接件热输入由1.0 kJ/mm增大至2.0 kJ/mm时,焊接件强度折减由0%增大至8%;而对于50 mm板焊接件热输入由2.4 kJ/mm增大至5.0 kJ/mm时,焊接件强度折减保持在4%左右;而对于70 mm板焊接件热输入由2.4 kJ/mm增大至5.0 kJ/mm时,焊接件强度折减保持在1%以内。可以看到对于厚板焊接件,热输入的增大引起的焊接件强度折减的波动更小,因而在厚板焊接时,可以使用更大的热输入以提高焊接效率。同时,提供了有关这些建筑用高强度钢板及其对焊部分机械性能的重要试验证据。试验证明,只要按照既定的焊接规范对焊接过程进行适当控制,这些对焊部分的机械性能几乎不会降低,甚至不降低。因此,这些厚的高强度Q690钢之间的全强度对焊型材在实践中很容易实现,与通常采用的Q355钢类似。

关键词：高强钢焊接焊后力学性能

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A study of influence of gravity on bulk behaviour of particulate solid

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Particuology 2008年第6期6卷 467-474页

作者： Yun-Chi chung jin Yeam Ooi Department of Civil and Environmental Engineering Nanya Institute of Technology Institute for Infrastructure & Environment School of Engineering & Electronics University of Edinburgh

This paper examines the influence of gravity on the bulk responses of a granular solid. The loading scenarios in this study include confined compression, rod penetration into a granular medium and discharging through an orifice. Similar loading and flow conditions are likely to be encountered in the stress and deformation regimes that regoliths are subjected to in extraterrestrial exploration activities including in situ resource utilisation processes. Both spherical and non-spherical particles were studied using the discrete element method （DEM）. Whilst DEM is increasingly used to model granular solids, careful validations of the simulation outcomes are rather rare. Thus in addition to exploring the effect of gravity, this paper also compares DEM simulations with experiments under terrestrial condition to verify whether DEM can produce satisfactory predictions. The terrestrial experiments were conducted with great care and simulated closely using DEM. The key mechanical and geometrical properties for the particles were measured in laboratory tests for use in the DEM simulations. A series of DEM computations were then performed under reduced gravity to simulate these experiments under extraterrestrial environment. It was found that gravity has no noticeable effect on the force transmission in the confined compression case; the loading gradient in the rod penetration is linearly proportional to the gravity; the mass flow rate in silo discharge is proportional to square root of the gravity and the angle of repose increases with reducing gravity. These findings are in agreement with expectation and existing scientific evidence.

关键词： Extraterrestrial Particulate assembly Confined compression Rod penetration Silo discharge Discrete element method Gravity effect

Efficient controller area network data compression for automobile apphcations

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Frontiers of Information Technology & Electronic Engineering 2015年第1期16卷 70-78页

作者： Yu-jing WU jin-Gyun chung Division of Electronics & Information Engineering Chonbuk National University Jeonju 561-756 Korea

目的:控制器局域网CAN(controller area network)被设计作为汽车环境和高级工业控制应用中电子控制单元ECUs(electronic control units)之间的多路通讯。如果大量ECUs连接到CAN总线,会导致CAN总线陷入超载状态,待命时间和数据传输误差... 详细信息

目的:控制器局域网CAN(controller area network)被设计作为汽车环境和高级工业控制应用中电子控制单元ECUs(electronic control units)之间的多路通讯。如果大量ECUs连接到CAN总线,会导致CAN总线陷入超载状态,待命时间和数据传输误差率也将增加。数据传输时间和帧长度成正比,因此需要减少CAN总线的数据帧长度。创新:与已有数据压缩方法相比,我们提出的方法不需要预测最大差值,只需使用三个头比特位。实验结果表明,CAN传输数据的压缩率高达81.06%。方法:首先,用信号重排方法将车辆技术标准中的信号重排,使数据帧内的信号缩短到三个。然后,计算之前和现在CAN信号差值,并且计算三个头比特位。将头比特和差值不为零的信号排列到压缩区域选择图里,不为零的区域选择为压缩区域。最后,将压缩区域的数据排列到2D内存图里(图5,6)。结论:针对CAN总线超载和数据传输误差率的增加,提出一种高效的数据压缩方法,数据压缩率高达81.06%。

关键词：控制器局域网电子控制单元数据压缩信号重排

Analgesic efficacy of median nerve stimulation in mice with chemotherapy-induced peripheral neuropathy via modulation of brain-derived neurotrophic factor expression

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中医杂志:英文版 2023年第4期43卷 686-694页

作者： Dong-wook Kang Jae-Gyun Choi Hee Ju Song Jaehyuk Kim Miae Lee Taehee Kim Suk-Yun Kang Yeonhee Ryu Hwa Seung Yoo jin Sun Lee jin Bong Park Sang Do Lee Hyun-Woo Kim Department of Physiology and Medical Science College of Medicine and Brain Research InstituteChungnam National UniversityDaejeon 35015Republic of Korea KM Fundamental Research Division Korea Institute of Oriental Medicine Daejeon 34054Republic of Korea East-West Cancer Center Dunsan Korean Medicine Hospital of Daejeon UniversityDaejeon 35234Republic of Korea Department of Surgery Chungnam National University HospitalDaejeon 35015Republic of Korea Laboratory of Veterinary Pharmacology College of Veterinary Medicine and Research Institute for Veterinary ScienceSeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea

OBJECTIVE:Chemotherapeutic agents such as docetaxel(DTX)can trigger chemotherapy-induced peripheral neuropathy(CIPN),which is characterized by unbearable *** study was designed to investigate the analgesic effect and related neuronal mechanism of low-frequency median nerve stimulation(LFMNS)on DTX-induced tactile hypersensitivity in ***:To produce CIPN,DTX was administered intraperitoneally 4 times,once every 2 d,to male ICR *** was performed on the wrist area,and the pain response was measured using von Frey filaments on both hind *** blot and immunofluorescence staining were performed using dorsal root ganglion and spinal cord samples to measure the expression of brainderived neurotrophic factor(BDNF).RESULTS:Repeated LFMNS significantly attenuated the DTX-induced abnormal sensory response and suppressed the enhanced expression of BDNF in the DRG neurons and spinal dorsal ***:LFMNS might be an effective nonpharmaceutical option for treating patients suffering from CIPN via regulating the expression of peripheral and central BDNF.

关键词： analgesia brain-derived neurotrophic factor chemotherapy-induced peripheral neuropathy docetaxel nerve stimulation

Inverse correlation between gastroesophageal reflux disease and atrophic gastritis assessed by endoscopy and serology

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World Journal of Gastroenterology 2022年第8期28卷 853-867页

作者： Yoo Min Han Su jin chung Seokha Yoo Jong In Yang Ji Min Choi Jooyoung Lee Joo Sung Kim Department of Internal Medicine and Healthcare Research Institute Seoul National University Hospital Healthcare System Gangnam CenterSeoul 06236South Korea Department of Anesthesiology and Pain Medicine Seoul National University College of MedicineSeoul 03080South Korea Department of Internal Medicine and Liver Research Institute Seoul National University College of MedicineSeoul 03080South Korea

BACKGROUND Helicobacter pylori(***)infection is known to prevent the occurrence of gastroesophageal reflux disease(GERD)by inducing gastric mucosal ***,little is known about the relationship between atrophic gastritis(AG)and *** To confirm the inverse correlation between AG and the occurrence and severity of *** Individuals receiving health checkups who underwent upper gastrointestinal endoscopy at Seoul National University Healthcare System Gangnam Center were *** grade of reflux esophagitis was evaluated according to the Los Angeles *** AG(EAG)was categorized into six *** AG(SAG)was defined as pepsinogen I≤70 ng/m L and pepsinogen I/II ratio≤*** association between the extent of EAG and SAG and the occurrence and severity of GERD was evaluated using multivariate logistic regression *** In total,4684 individuals with GERD were compared with 21901 healthy *** multivariate logistic regression analysis,advanced age,male sex,body mass index>23 kg/m2,presence of metabolic syndrome,current smoking,and alcohol consumption were associated with an increased risk of *** for *** immunoglobulin G antibodies was associated with a decreased risk of *** was an inverse correlation between the extent of EAG and occurrence of GERD:Odds ratio(OR),1.01[95%confidence interval(CI):0.90-1.14]in C1,0.87(0.78-0.97)in C2,0.71(0.62-0.80)in C3,0.52(0.44-0.61)in O1,0.37(0.29-0.48)in O2,and 0.28(0.18-0.43)in ***,the extent of EAG showed an inverse correlation with the severity of *** presence of SAG was correlated with a reduced risk of GERD(OR=0.49,95%CI:0.28-0.87,P=0.014).CONCLUSION The extent of EAG and SAG exhibited strong inverse relationships with the occurrence and severity of *** followed by *** infection may be independently protect against GERD.

关键词： Gastroesophageal reflux disease Reflux esophagitis Helicobacter pylori Atrophic gastritis Pepsinogen

Quasi-two-dimensional perovskite light emitting diodes for bright future

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Light(Science & Applications) 2021年第5期10卷 715-716页

作者： jin-wook Lee Nam-Gyu Park SKKU Advanced Institute of Nanotechnology(SAINT)and Department of Nanoengineering Sungkyunkwan UniversitySuwon 16419Republic of Korea School of Chemical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

The fundamentals,promise and challenges of metal halide quasi-two-dimensional(quasi-2D)perovskites for a next generation emitter in light emitting diode devices are systematically reviewed.

关键词： diodes emitter emitting

Lithium plating-free 1 Ah-level high-voltage lithium-ion pouch battery via ambi-functional pentaerythritol disulfate

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能源化学:英文版 2023年第8期83卷 229-238,I0007页

作者： Dung Tien Tuan Vu jinsol Im Jae-Hee Kim Jisoo Han Gyeong Jun chung Giang Thi Huong Nguyen Junhyeok Seo Minjae Kim Eui-Hyung Hwang Young-Gil Kwon Jae wook Shin Kuk Young Cho Seung-Wan Song Department of Chemical Engineering&Applied Chemistry Chungnam National UniversityDaejeon 34134Republic of Korea Department of Materials Science&Chemical Engineering Hanyang UniversityAnsan 15588Republic of Korea Fine Chem Co.Ltd. Daejeon 34365Republic of Korea d CSIM Co.Ltd. Yesan 32400Republic of Korea Dongwha Electrolyte Nonsan 32925Republic of Korea

Elevating the charge cut-off voltage beyond traditional 4.2 V is a commonly accepted technology to increase the energy density of Li-ion batteries(LIBs) but the risk of Li-dendrites and fire hazard increases as well. The use of ambi-functional additive, which forms stable solid electrolyte interphase(SEI) simultaneously at both cathode and anode, is a key to enabling a dendrites-free and well-working high-voltage LIB. Herein, a novel ambi-functional additive, pentaerythritol disulfate(PEDS), at 1 wt% without any other additive is demonstrated. We show the feasibility and high impacts of PEDS in forming lithium sulfateincorporated robust SEI layers at NCM523 cathode and graphite anode in 1 Ah-level pouch cell under4.4 V, 25 °C and 0.1 C rate, which mitigates the high-voltage instability, metal-dissolution and cracks on NCM523 particles, and prevents Li-dendrites at graphite anode. Improved capacity retention of 83%after 300 cycles is thereby achieved, with respect to 69% with base electrolyte, offering a promising path toward the design of practical high-energy LIBs.

关键词： Lithium-ion pouch cell Lithium plating-free High-voltage Ambi-functional additive SEI layer

Room-temperature synthesis of ZrSnO4 nanoparticles for electron transport layer in efficient planar hetrojunction perovskite solar cells

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Journal of Materials Science & Technology 2020年第7期42卷 38-45页

作者： Young wook Noh In Su jin Sang Hyun Park Jae Woong Jung Department of Advanced Materials Engineering for Information&Electronics Kyung Hee University1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do 446-701Republic of Korea

The interface engineering plays a key role in controlled optoelectronic properties of perovskite photovoltaic devices,and thus the electron transport layer(ETL)material with tailored optoelectronic properties remains a challenge for achieving high photovoltaic performance of planar perovskite solar cells(PSCs).Here,the fine and crystalline zirconium stanate(ZrSnO4)nanoparticles(NPs)was synthesized at low temperature,and its optoelectronic properties are systematically *** from the favorable electronic structure of ZrSnO4 NPs for applications in ETL,efficient electron transport and extraction with suppre s sed charge recombination are achieved at the interface of perovskite *** a result,the optimized ZrSnO4 NPs synthesized at room-temperature deliver the optimized power conversion efficiency up to 16.76%with acceptable *** work opens up a new class of ternary metal oxide for the use in ETL of the planar PSCs and should pave the way toward designing new interfacial materials for practical optoelectronic devices.

关键词： ZrSnO4 Electron transport layer Nanoparticles Perovskite solar cells

Differential risk of 23 site-specific incident cancers and cancer-related mortality among patients withmetabolic dysfunction-associated fatty liver disease:a population-based cohort study with 9.7 million Korean subjects

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Cancer Communications 2023年第8期43卷 863-876页

作者： Goh Eun chung Su Jong Yu Jeong-Ju Yoo Yuri Cho Kyu-na Lee Dong wook Shin Yoon Jun Kim Jung-Hwan Yoon Kyungdo Han Eun Ju Cho Department of Internal Medicine and Healthcare Research Institute Seoul National University Hospital Healthcare System Gangnam CenterSeoulRepublic of Korea Department of Internal Medicine and Liver Research Institute Seoul National University College of MedicineSeoulRepublic of Korea Department of Gastroenterology and Hepatology Soonchunhyang University Bucheon HospitalBucheonGyeonggi-doRepublic of Korea Center for Liver and Pancreatobiliary Cancer National Cancer CenterGoyangGyeonggi-doRepublic of Korea Department of Biomedicine&Health Science Catholic University of KoreaSeoulRepublic of Korea Department of Family Medicine/Supportive care center Samsung Medical CenterSungkyunkwan University School of MedicineSeoulRepublic of Korea Department of Clinical Research Design and Evaluation/Department of Digital Health Samsung Advanced Institute for Health ScienceSeoulRepublic of Korea Department of Statistics and Actuarial Science Soongsil UniversitySeoulRepublic of Korea

Introduction:Although an association between metabolic dysfunctionassociated fatty liver disease(MAFLD)and cardiovascular disease or overall mortality has been reported,it is unclearwhether there is an association between MAFLD and cancer incidence or *** aimed to investigate the differential risk of all-and site-specific cancer incidence and mortality according to MAFLD subgroups categorized by additional etiologies of liver ***:Using the Korean National Health Insurance Service database,we stratified the participants into three groups:(1)single-etiology MAFLD(SMAFLD)or MAFLD of pure metabolic origin;(2)mixed-etiology MAFLD(M-MAFLD)or MAFLD with additional etiological factor(s)(i.e.,concomitant liver diseases and/or heavy alcohol consumption);and(3)*** steatosis and fibrosiswere defined using the fatty liver index and the BARDscore,*** proportional hazards regression was performed to estimate the risk of cancer ***:Among the 9,718,182 participants,the prevalence of S-MAFLD and M-MAFLD was 29.2%and 6.7%,*** the median 8.3 years of follow-up,510,330(5.3%)individuals were newly diagnosed with cancer,and 122,774(1.3%)cancer-related deaths occurred among the entire *** with the non-MAFLD group,the risk of all-cancer incidence and mortality was slightly higher among patients in the S-MAFLD group(incidence,adjusted hazard ratio[aHR]=1.03;95%confidence interval[CI]:1.02−1.04;mortality,aHR=1.06;95%CI:1.04−1.08)and highest among patients with M-MAFLD group(incidence,aHR=1.31;95%CI:1.29−1.32;mortality,aHR=1.45;95%CI:1.42−1.48,respectively).The M-MAFLD with fibrosis group(BARD score≥2)showed the highest relative risk of all-cancer incidence(aHR=1.38,95%CI=1.36–1.39),followed by the M-MAFLD without fibrosis group(aHR=1.09,95%CI=1.06–1.11).Similar trends were observed for cancer-related ***:MAFLD classification,by applying additional etiologies other than pure metabolic origi

关键词： cancer etiology metabolic mortality steatosis